Renesas RA4W1 Application Note

RA4W1 Group
Guidelines for 2.4 GHz Wireless Board Design
Introduction
This document describes RF board design guidelines for RF transceiver.
Target Device
RA4W1 Group
Note: The contents of this document are provided as a reference and do not guarantee the signal quality in
the system. When designing the actual system, thoroughly evaluate the product in the overall system
and apply these contents on your own responsibility.
Contents
1. Overview .................................................................................................................................... 3
1.1 Related documents ................................................................................................................................. 3
2. Board design guidelines ............................................................................................................ 4
2.1 Pin list of the RF transceiver unit ............................................................................................................. 4
2.2 Oscillator circuit for the Wireless-dedicated (Bluetooth-dedicated) clock ............................................... 5
2.3 Antenna Connection pin .......................................................................................................................... 7
2.3.1 Impedance of the signal line form an antenna to the "ANT" pin ............................................................ 7
2.3.2 RF Filter for spurious emissions reduction ............................................................................................ 8
2.4 Power supply mode for the RF transceiver ........................................................................................... 10
2.4.1 DC-DC converter mode ....................................................................................................................... 10
2.4.2 Linear regulator mode ......................................................................................................................... 12
2.5 Power supply and ground patterns........................................................................................................ 14
2.5.1 Power supply ....................................................................................................................................... 14
2.5.2 Ground ................................................................................................................................................. 14
2.6 Circuit diagram for reference ................................................................................................................. 16
2.7 Parts list for reference ........................................................................................................................... 17
Revision History .............................................................................................................................. 18
R01AN4886EJ0100 Rev.1.00
May.07.20
Application Note
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